Lifting-jack.



iinirnp smarts PATENT @FFEQE.

'cHnnLEswILsonrAn-Knn, o'r'mnsns crrr, MISSOURI, AND mnononn n. wrrrmrr,

or noarn E03 '1 WORTH, TEXAS, .AiS SIGNORS To THE AUTOMATIC .LIFTING JAUK COMPANY, OF DAYTON, OHIO, A CORPQRA'IION OF OHIO.

I LIFi'ING-J-A CK.

Application filed June 1, 1914. Serial No. 842,234.

The present invention relatesh) lifting- I jacks and more particularly to that type the controlling 'mechanlsm adapted to lower the'lifting bar by a stepby-step movement as well as to elevate the lifting bar by such a movement, an object .of the invention being to provide a construction in which'the operating member of or reversing mechanism is arranged upon the handle which effects the step-by-step movements so that it-is unnecessary for the user of the device to reach under a vehicle in order to effeet the lowering of the lifting bar.

Another object'of the invention is to provide a "construction in which the lowering and the raising of the lifting bar may both be effected by a step-by-step movement produced by a single pair of dogs. 4 To these and other ends the'invention consists in certain parts and combinations of parts all of which .QVlll be hereinafter described, the novel features being pointed out in the appended claims.

In the drawings: Figure l is a side view of a lifting-jack constructed in accordance with the present improvements; Fig. 2 is an enlarged section on the line aa, Fig. 1;

Fig. 3 is a section on t'he'line bb, Fig. l

with the parts enlarged; Fig.4 shows the standard in vertical. section and the liftingbar with the two dogs in plan, the lifting-jack being adjusted for raising the lifting bar; Fig; 5 is a section on the line 0-0, Fig. 4;

I Fig. 6 showsthe position of the operating lever as the retaining dog is kicked out on the lowering of the lifting-barz-Fig. 7 is a detail vieivshowing the positfi'; g? the operating lever as the lifting and lowering dog is kicked out on the lowering of the lifting bar; and Fig. 8 is a detail View of the slot in which operates the spring which. controls the lifting dog.

Referring more particularly to the draw- Specification of Letters Patent.

Patented an. is, rare.

ings, 1 indicates a standard made in any suitable manner and having a vertical chamber in which operates the lifting bar 2 also of anysuitable construction and preferably having a rigid seat 3 in its upper end on the exterior of the casing to engage with the ob-- -ject to be lifted. On one side of this lifting socket piece 10 which projects between and is pivoted at 11 t0 the ears 8.

The inner end of the operating lever is preferably bifurcated at 12 beyond the pivot 11 and, between the arms of this bifurcation, a lifting and lowering dog or pawl 13 is pivoted preferably loosely upon a pivot pin 14 to engage. with teeth 4-. of the lifting-bar This dog or pawl 13 may also be adapted for a lateral movement in the direction of its axis 14 and between the arms of the bifurcated portion 12. Normally, this dog is held toward the lifting-bar 2 and toward one arm of the bifurcated portion 12, this preferably being accomplished. by a helical spring 15 which surrounds thepivot pin 14 and has one end secured to the dog 13 and the-other the chamber 5. A finger-piece or projection 19 may extend laterally from the dog 16 through the plate 6 in order to permit the .dog 16 to be moved and held out of engagement with the lifting bar 2. It is apparent that, when the operating lever is raised, the lifting dog 13 will ride over the ratchet v teeth of the lifting bar 2 and, upon the lowering of the operating lever, said dog 13 will move upwardly and carry the lifting bar 2 therewith, the retaining dog 16 yieldingduring the movement of the lifting bar and finally retaining the lifting bar in its elevated position during the next downward- .is preferably accomplished by kicking out the retaining pawl 16 at the upper portion of the movement of the pawl 13 and causing the said lifting pawl. to have engagement with the lifting bar 2 during the entire lowering movement so that the pawl 13 holds the lifting bar during the lowering move ment. At the lower end of the downward movement of the'pawl 13, the latter is kicked out of engagement with the lifting bar. 2 but not until the pawl 16 has reengaged the lifting bar to hold the latter until said pawl 16 is again kicked out of engagement with the lifting bar. In the illustrated embodiment of the invention, these movements of the two dogs are effected by two springs which are inactive during the lifting action of the jack but are rendered active during the reversing action. One of these springs acts to kick the lifting and lowering dog 13 out of engagement with the lifting ban 2 as the lifting and lowering dog 13 reaches the lower portion of its movement but is inactive during the lowering movement of the dog, while the other spring acts to kick the retaining dog out of retaining position after the lifting and lowering dog has been re turned into engagement with the lifting bar butis inactive during the upward and downward movement of the lifting and lowering dog 13. In this embodiment, these springs are respectively indicated at 20 and 21 be ing formed from a single piece of metal secured at 22 to the dog 1.3, one extending be low the dog and the other extending above the dog. When the liftiug-jack is adjusted for the lifting operation, the ends'of these twosprings work free so that they do not effect the operation of the lifting and lowering dog 13, the spring 20 operating in the enlarged portion 23 of a slot in the lower wall of the chamber 5, and the spring 21 operating to one side of a projection 24 extending downwardly from the dog 16. However, when the lifting and lowering dog '13 is shifted laterally or axially on the-pivot 14, the ends of these springs are respectively brought into" cooperative relation with the shoulder 25 formed by one wall of the reduced portion 26 of the slot in the chamber 5 and with the projection 24, so that, on

thedownward movement of the lifting and lowering dog 13, the deflectedend 27 willand may thereafter be carried upwardly free from the lifting bar until its upper beveled end 28 engages with the stud or projection 29, when the lifting pawl or dog 13 will be forced inwardly toward the lift- 2 ing bar. During this inward movement of the lifting andlowering pawl 13, the deflected end 30 of the spring 21' engages with the projection 24 on the retaining pawl 16 and the-spring 21 is thereby placed an-- der tension overcoming the tension of spring 18 so that, by the time the nose of the lift-' ing pawl 13 engages with a rack tQQth 4, the

pawl 16 will be kicked. out. of engagement with the lifting bar 2, thereby permitting the lowering of the lifting and lowering pawl 13. Any suitable means may be employed for shifting the lifting and lowering pawl 13 on its pivot pin 14, but it is preferred to provide the lifting and lowering pawl 13 with a cam portion 31 adapted to be engaged by the cam end 32 of a longitudinally movable rod 33 which is guided at 34 on i the handle and has an operating portion 34* formedv by a cap on the laterally-turned end 35 of: the rod 33, the rod lying on one side of the handle and the laterally-turned end extending through a slot 36 of the handle so that, when the cap 34*- is secured thereto, it holds the rod 33th the handle.-

This rod 33 may also be utilized for locking the handle 9 to the socket piece 10 and to this end the rod is provided with a cam portion 37 which 'coiiperates with a small locking device 38 in order to project said locking device from one side of the handle so that the locking device may be extended into an opening 39 in the side wall of the "socket piece 10. The controlling member 33 thusmay assume three positions,'one at the extreme outer end of the slot 36 to detach the handle from the socket, another at the'middle of the slot 36 to lock the handle;

to the socket, and another at the extreme inner end of the slot 3 to cause the beveled end 32 to engage the cam face 31 to shift the lifting and lowering dog 13 so that the springs 20 and 21 are brought into action.

The operationof the invention will be--' understood from the foregoing but it may be summarized as follows: For raising the lifting bar 2-,-the controlling. member 33 is\ dog 13 lowers while the dog 16 holds the met,

lifting bar in its adjusted position. Upon the lowering of the operating lever, the lifting dog 13 elevates the. lifting'bar 2. This is continued until the lifting bar has reached the desired position. To lower the lifting bar, the controlling piece 33 v is shifted to cause its end 32 to engage the cam face 31. and shift the dog 13' laterally. With the raising of the operating lever, the dog 31 lowers and places the spring under tension, causing the dog 13, when it reaches its lowermost position, to become disengaged from the lifting bar 2-. Upon the lowering of the operating lever, the dog 13 is raised until it engages the shoulder 29, when it is caused to move inwardly to engage the lifting bar 2. At this time, the

'- spring 21 engages the projections 24: and is .two dogs placed'under tenslon, which kicks out the dog 16 immediately that the dog 13 starts to elevate the bar 2 so that the bar 2 may descend with the dog 13. An immediate descent of the bar 2 may be obtained by moving the operating leverto its uppermost position and then shifting the dog 16 by means of the finger piece 19.

A lifting-jack constructed in accordance with this invention. may be controlled entirely from the handle which carries acons trolling member for efiecting the reversing movement of the lifting-jack. This controlling member also serves for uniting the handle of the operating lever to the socket member. The lifting-jack employs only for efiecting the lifting and the reversing action. One of these dogs is shifted bodily so that it changes its positi'on relatively to the other dog for the different actions. Two springs are brought into action upon the shifting of this bodily movable dog, one of said springs serving to kick out the lifting dog and the other spring serving to kick out the retaining dog.. The whole arrangement permits the provision of an inexpensive construction as it eliminates a great number of the parts now present in reversing lifting-jacks. It also does away with the necessity of crawling under a vehicle in order to reverseithe 1' ackto effect the lowering of the vehicle, the re versing being controlled from the handle.

hat we claim as our invention and desire to secure by Letters Patent, is-

1. A lifting jack comprising a standard, a lifting bar movable on the standard, a retaining dog for holding the lifting bar, a

lifting and lowering dog shiftable laterally to either of two positions, one to effect the lowering of the lifting bar and the other to effect the raising of the lifting bar,,and a rod having a cam for cooperation with the lifting and. lowering dog to control the po-v sition of said dog.

V 2. A lifting jack comprising a standardri a lifting bar movable on the standard, a ret min dog at the lifting bar, a lifting and lowering dog, an operating member for the lifting and lowering dog, two opposite a lifting bar movable on the standard, an

operating member, a lifting dog for the lifting bar moved by said operating memher, a retaining dog for the lifting bar, two

springs carried by-the lifting dog and extending in opposite directions, one engaged near its free end by the retaining dog during the upper portion, of the movement of the lifting dog to kick out the retaining dog, and a. shoulder engaging tne other arm near the end of the latter, during he lower portion of the movement of the lifting dog to kick out the lifting dog. v

4. A lifting jack comprising a standard,

I a lifting bar onthe standard, an operating member, a lifting dog for the lifting bar moved by said operating member, a retain ing dogfor the lifting bar, a double armed spring fastened centrally to said lifting dog, and having its ends deflected, the end of one arm engaging the retainingdog during the upward movement of the lifting dog, to kick out the retaining dog, and the end of the other arm engaging a fixed part during the lower portion of the movement of-the lifting dog to kick out the lifting dog." 5. lifting-jack comprising a standard, a lifting bar. movable on the standard, an operating member, a lifting dog for the lifting bar moved by the operating member, and a retaining dog for the-lifting bar, one of said-dogs being bodily shiftable in order to part of its movement.

6. A lifting-jack comprising a standard, i

a lifting bar movable. on the standard, an operating member, a lifting dog for the lifting bar moved by the operating member, a retaining dog for the lifting bar, one of said dogs being bodily shiftable', and two springs adapted to be brought into action when the. shiftable dog is moved bodily in one direction, one of said springs acting to kick out. the retaining dog when the lifting dog is at the upper portion of its movement and the,

: other of said springs actingto kick out the p A lifting dog when the latter is at its lower:

portion of its movement.

' brought into action when the bodily movable dog is shifted, and being adapted to kick out the retaining dog when the lifting dog is at the upper portion of its movement.

8. A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating member, a lifting dog for the lifting bar moved by the operating member, a retaining dog for the lifting bar; one of said dogs being bodily movable, and a spring brought into action when the bodily movable dog is shifted and. being adapted to kickout the lifting dog when the latter is at the lower portion of its movement."

9. A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating member, a lifting dog for the lifting bar moved by the operating member, and a retaining dog for the lifting bar, the lifting dog being movable bodily on the operating member and adapted to kick out the retaining dog When said lifting dog has reached the upper portion of its movement.

10. A lifting jack comprising a standard, a lifting bar and a pair of dogs for feeding said barstep by step upward and downward, a lever pivoted to said standard,,a rod attached to the lever and provided With a cam at the inner end of the same, for controlling said dogs to determine whether the dogs are to-feed the lifting bar up or down. 7

11. A lifting jack comprising a standard, a lifting bar movable on the standard, and-a feeding mechanism for raising and lowering said bar by a step by step movement said -mechanism comprising two dogs one of which is shiftable laterally and is provided with two spring arms extending in opposite directions, one of said arms being arranged to kick out one of said dogs andthe other of said arms being arranged to kick out the other dog.

12. A lifting jack comprising a standard,

a lifting bar movable on the standard, a retaining dog for the lifting bar, a socket piv-' oted te the stanilard, a lifting dog mounted on the socket and shiftable thereon, a lever fitted in said. socket, a locking device for holding the lever in the socket, and a rod adjustable to control the position of the lifting dog and the locking device.

13. A lifting jack comprising a standard, a lifting bar, and a mechanism for feeding the'lifting bar upwardly by a step by step movement anddownwardly by a step by step "movement, said mechanism embodying an operating member including a socket piece, a

" handle} a, locking device for securing the handle to the socket piece, and a rod for conicense dog being movable bodily on the operating member and adapted to kick out the retaining dogwhen the lifting dog is at the upper portion of its movement, and a controlling member arranged on the operating member and adapted to control the position of-the lifting dog.

15/A lifting jack comprising a standard,

a lifting bar movable on the standard, an. operating member, a lifting dog for the lifting bar pivoted to the operating member and movable laterally thereon, and a retaining dog for the lifting bar adapted when the lifting dog has been adjusted to a certain position to be kicked out of the retaining position by the lifting dog as the latter reaches the upper portion of itsmovement.

16. A lifting-jackcomprising a standard, a lifting bar movable on the standard, an operating member, a lifting dog for the lifting bar pivoted to the operating member and movable laterally thereon, and a re taining dog for the lifting bar adapted 9 reaches the upper portion of its movement and a controlling member arranged on the operating member and adapted to control the position of the lifting dog.

1'1 A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating member, a lifting dog for the lifting bar pivoted to the operating member and movable laterally thereon, a retaining dog for the lifting bar adapted, when the lifting bar has been adjusted to a certain positionto be kicked out of retaining posi tion by the lifting dog when the latter is at the upper portion of its movement, and a controlling rod adjustable longitudinally of the operating member and having a cam portion at one end adapted to cotiperate with the lifting dog to shift the latter laterally.

18. A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating lever pivoted to the standard, a pivot pin on the operating member, a lifting dog mounted to turn on a pin and to move axially thereof, a coil springsurrounding the pin and secured at one end to the dog and at the other end to the lever, said spring having the dual function of holding the dog toward the lifting bar and also in a certain position longitudinally of the pin, means for shifting the lifting dog longitudinally of the pin, and a retaining dog for the lifting bar, adapted when the lifting dog has been adjusted by said means, to be kicked out of retaining position by the lifting do when the latter is at the upper portion of its movement.

19. A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating member, a lifting dog for the lifting bar pivoted to the operating member and movable thereon, a spring inactive when the lifting dog is in one position on the op.- erating member and brought into action when the lifting dog is in another position on the operating member to kick out the lifting dog when the latter is at the lower portion of its movement.

20. A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating lever, a lifting dog for the 1ifting bar pivoted to the operating member and movable laterally thereon, a spring arm inactive when the lifting dog is in one position on the operating member, and a shoulder adapted to engage the spring arm when the lifting dog is in another position on the operating member to kick out the lifting dog when the latter is at the lower portion of its movement.

21. A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating member, a lifting dog for the lifting bar pivoted to the operating member and movable laterally thereon, and a spring arm inactive when the lifting dog is in one position on the operating member and adapted to be compressed by the lifting dog when in another position on the operating member to kick out the retaining dog when the lifting dog is at the upper portion of its movement.

22. A lifting-jack comprising a standard, a lifting bar movable on the standard, an operating member, a lifting dog for the lifting bar pivoted to the operating member and movable laterally thereon, a retaining dog for the lifting bar, two spring arms extending in opposite directions from the lifting dog, one of said sprin arms being adapted, when the lifting dog is adjusted to one position to cooperate with the retaining dog when the lifting dog is at the upper portion of its movement to kick out the retaining dog, and a shoulder adapted to engage the other spring arm when the lifting dog is adjusted on the operating member, to cause said spring to kick out the liftingdog when the latter is at the lower portion of its movement. a

' CHARLES WILSON PARKER:

THEODORE H. WITTLIFF, Witnesses:

HAROLD H. SIMMS, ADA M. "WHI'TMORE, 

